javascript - 用 Switch 替换 If Else 链 : Unreachable after return

Question

function chainToSwitch(val) {
  var answer = "";
  // Only change code below this line
  switch (val) {
    case "bob":
      answer = "Marley";
      break;
    case 42: 
      answer = "The answer";
      break;
    case 1:
      answer = "There is no #1";
      break;
    case 99:
      answer = "Missed me by this much!";
      break;
    case 7:
      answer = "Ate Nine";
      break;
    default: 
      answer = "not correct";
  }
}

  // Only change code above this line  
  return answer; 


// Change this value to test
chainToSwitch(7);

我还是不明白为什么它无法访问。我正在学习 FreeCodeCamp 类(class)，但我被困在这一门类(class)中。我什至已经进入了答案的源代码，但它仍然对我不起作用。

Answer 1

您需要将 return 语句移至函数内部。

function chainToSwitch(val) {
  var answer = "";
  // Only change code below this line
  switch (val) {
    case "bob":
      answer = "Marley";
      break;
    case 42: 
      answer = "The answer";
      break;
    case 1:
      answer = "There is no #1";
      break;
    case 99:
      answer = "Missed me by this much!";
      break;
    case 7:
      answer = "Ate Nine";
      break;
    default: 
      answer = "not correct";
  }
  return answer; 
}

console.log(chainToSwitch(7));